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  1. #1
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    Default Blown motor? Cracked head? Head gasket?

    Well, I went wheeling for the first time. A bunch of us took a trip to PA (rauschs creek). Jeep performed great until the end. Somehow all the water i had in the radiator just vanished. Didn't have any smoke or overheating allllll day. I was on the last trail and got stuck on some rocks and I over heated and I waited and cooled down and took off after that. A little while after, I hear a tick coming from the motor. Only ticks when I give it gas. The tick eventually gets louder as I give it gas and when we leave, I jump on the HW and it died and never started back up. I think I blew the head gasket or possibly damaged the head (cracked). I filled up the radiator today and tried starting it but got nothing. I had power and fuel but as far as spark..well....I pull all plugs and two or three of them had water on them. I started breaking down the motor and these are the pics so far....









  2. #2
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    Don't look too good. Pull the head and see if the cylinders have water in them. I have heard of an internal hydro lock but never have seen one.
    Hey bubba get your hand off my ass,

    Some days it is just not worth it to gnaw through the leather restraints.

    R.I.P. Brian 96_XJ Perrine 1990-2011

  3. #3
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    Water sitting on top of the pistons....lots of water







    The cylinder walls are perfect. The pistons are clean. Two pistons are these marks on them. Don't know what its from. I turned the crank and all pistons move just fine. Dropping the heads and the manifold off tomorrow. I hope the heads come out ok.

  4. #4
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    Good luck, but that seems like more than just a blown head gasket. When you have the head at the machine shop make sure they magnaflux it to check for cracks.
    Let us know what they have to say about it.
    Hey bubba get your hand off my ass,

    Some days it is just not worth it to gnaw through the leather restraints.

    R.I.P. Brian 96_XJ Perrine 1990-2011

  5. #5
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    This brings back nightmares for me, good luck Cobrajay

  6. #6
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    Quote Originally Posted by BlueXJ View Post
    Good luck, but that seems like more than just a blown head gasket. When you have the head at the machine shop make sure they magnaflux it to check for cracks.
    Let us know what they have to say about it.
    Isn't it possible that he hydro-locked? Shouldn't he have a close look at those rods?

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    Quote Originally Posted by BlueXJ View Post
    Good luck, but that seems like more than just a blown head gasket. When you have the head at the machine shop make sure they magnaflux it to check for cracks.
    Let us know what they have to say about it.
    Excellent advice right there , I too have heard of internal hydrolock but in my years have never seen one. I probably would pull the pan and check out the bottom end also
    Aint got no whistle, don't belch out smoke, but my V10 aint no joke !!!

  8. #8
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    good luck does not look good. but i would say that the head gasket is bad.
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  9. #9
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    I also suggest checking out the bottom end.
    I know it's too late now, but any time a HG or cracked head is suspected I do a coolant system pressure test. And before a teardown I do a compression test if possible as a diagnostic aid. JMO
    And good luck.

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    Are you going to repair this or replace the engine?
    Dave

    Trail Rig: 2000 XJ, Built & Caged

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    Quote Originally Posted by 2000XJ View Post
    Are you going to repair this or replace the engine?
    I'm not sure. I'm going to take a look at the bottom end tomorrow morning. Dropping the head off to get checked out and the manifold to get cleaned out.

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    Quote Originally Posted by Cobrajay View Post
    I'm not sure. I'm going to take a look at the bottom end tomorrow morning. Dropping the head off to get checked out and the manifold to get cleaned out.
    I know this is going to cost you more than you have, murphy's law, but it would be a great time to replace the intake with a 99+ intake. ebay usually has them for 90.

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    Quote Originally Posted by Mudderoy View Post
    I know this is going to cost you more than you have, murphy's law, but it would be a great time to replace the intake with a 99+ intake. ebay usually has them for 90.
    Really? Are they that much better? Whats the difference? I'll do it

  14. #14
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    Well, talked to the guys at the machine shop. The head is all F'd up...warped and ALL the valves are bent. He said he's never seen a head in such bad shape. So bad that they are discolored. He said "Honestly Jay, I can rebuild it for you for 100 but if you did this much damage to the head, you most likely fried the piston rings, bearings ex ex and I should look into a rebuild or local junkyard" I said it makes no sense to take the risk in rebuilding the head and putting everything back together to find out 2k miles down the road and something let loose. I agreed so now I'm on the lookout for another motor. I was thinking of a stroker but F that....wayyyyy to much money. I want way more power for that kind of money but hey...its only a 6 i guess. A simple 4.0 motor will do it for me. I might get some head work tho and maybe a header, intake, TB spacer while im at it.

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    Quote Originally Posted by Cobrajay View Post
    Really? Are they that much better? Whats the difference? I'll do it
    Ours are angled and the 99+ is all curvy. The air flows better. I have read reports of 14 hp gain. Maybe someone else will jump in with their beliefs/experiences. If I could afford it I'd do it.

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